Capacity Optimization of an Hydrogen–Ammonia Hybrid Storage System With Concentrated Photovoltaic–Photothermal Power Generation

As a renewable energy carrier, hydrogen offers a promising solution to mitigate the intermittency of renewable energy and improve energy utilization efficiency, but it faces cost challenges in seasonal energy storage. To address this, this study proposes a hydrogen–ammonia hybrid storage system integrated with a concentrated photovoltaic photothermal (CPVT) process, where hydrogen serves for short‐ and long‐term energy storage. Furthermore, it utilizes waste heat from CPVT via an organic rankine cycle (ORC) for power generation. Additionally, a dual‐layer planning model is constructed to coordinate the generation and dispatch sides, with iterative solutions obtained using a reconstruction decomposition algorithm for optimal capacity configuration. Then, annual 8760‐h data are grouped into four seasons, with typical days extracted to represent seasonal generation and load characteristics, and three scenarios are constructed to evaluate the operational performance, including the supply–demand balance and levelized cost of electricity (LCOE). Capacity optimization results show that standalone short‐term hydrogen storage requires 1989.70 kg, standalone long‐term ammonia storage requires 1091.26 kg, while the hybrid system configures 1400.31 kg of hydrogen and 2800.63 kg of ammonia. Economically, the LCOE of the three scenarios is 0.13, 0.14, and 0.07 CNY/kWh, respectively. The core finding demonstrates that the hydrogen–ammonia hybrid storage system achieves intra‐day peak shaving through hydrogen and seasonal valley filling via ammonia, yielding a lower LCOE and significantly higher operational stability compared to standalone hydrogen or ammonia storage systems.